2V0-622 · Question #109
After deploying a vSphere Platform Services Controller (PSC), an administrator is unable to install vCenter Server. The error displayed is: Could not contact Lookup Service. Please check VM_ssoreg.log
The correct answer is A. Verify that the clocks on the host machines running the PSC, vCenter Server, and the vSphere C. Ensure that there is no firewall blocking port 7444 between the PSC and vCenter Server.. The 'Could not contact Lookup Service' error during vCenter installation typically points to time synchronization drift or a firewall blocking the PSC Lookup Service port.
Question
After deploying a vSphere Platform Services Controller (PSC), an administrator is unable to install vCenter Server. The error displayed is:
Could not contact Lookup Service. Please check VM_ssoreg.log. Which two actions can be taken to correct this problem? (Choose two.)
Options
- AVerify that the clocks on the host machines running the PSC, vCenter Server, and the vSphere
- BConfigure a valid Identity Source for the Platform Services Controller in the vSphere Web Client.
- CEnsure that there is no firewall blocking port 7444 between the PSC and vCenter Server.
- DUninstall and reinstall the Platform Services Controller software.
How the community answered
(14 responses)- A71% (10)
- B21% (3)
- D7% (1)
Why each option
The 'Could not contact Lookup Service' error during vCenter installation typically points to time synchronization drift or a firewall blocking the PSC Lookup Service port.
The PSC Lookup Service uses Kerberos-based authentication, which requires all participating machines to have clocks synchronized within a 5-minute window; a clock skew exceeding this threshold causes Kerberos tickets to be rejected, preventing vCenter from contacting the Lookup Service during installation.
Configuring an Identity Source in the vSphere Web Client is a post-installation administrative step and has no bearing on the installer's ability to contact the Lookup Service.
Port 7444 is the dedicated HTTPS port for the PSC Lookup Service; if a firewall rule is blocking this port between the PSC and the vCenter Server installer, the installer cannot reach the Lookup Service endpoint and will fail with this exact error.
Reinstalling the PSC does not resolve the underlying causes of this error - clock skew and firewall rules - which are environmental issues that would persist after a reinstall.
Concept tested: PSC Lookup Service connectivity and prerequisites
Source: https://kb.vmware.com/s/article/2121701
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